Dose-Adjusted EPOCH Chemotherapy and Rituximab (CD20+) in Previously Untreated Aggressive Non-Hodgkin's Lymphoma

INCLUSION CRITERIA: Non-Hodgkin's lymphomas in the following categories: mediastinal gray zone lymphoma and primary mediastinal B cell lymphoma. Diagnosis confirmed by staff of the Hematopathology Section, Laboratory of Pathology, NCI. Tissue blocks from patients treated in extramural sites must be forwarded to the NCI for analysis of bcl-2 by IHC and other markers within 1 month of study entry. Patients greater than or equal to 12 years old. Stage and Prognosis of Patients: Any stage for MGZL and PMBL. No prior systemic chemotherapy. Patients may be entered if they have had prior limited-field radiotherapy, a short course of glucocorticoids and/or cyclophosphamide for an urgent problem at diagnosis (e.g. epidural cord compression, superior vena cava syndrome). HIV negative. Not pregnant or nursing. Adequate major organ function [in adults: serum creatinine less than or equal to 1.5 mg/dl or creatinine clearance greater than 60 ml/min; and in children serum CR less than or equal to age-adjusted normal (age 12 to 15 maximum serum creatinine 1.2 mg/dl and age greater than 15 maximum serum creatinine 1.5 mg/dl); bilirubin less than 1.5 mg/dl; ANC greater than 1,000 and platelets greater than 100,000) unless impairment is due to organ involvement by lymphoma or immune-mediated mechanism caused by lymphoma. No active symptomatic ischemic heart disease, myocardial infarction or congestive heart failure within the past year. If MUGA is obtained, the LVEF should exceed 40%. No other serious concomitant medical illnesses or uncontrolled active infection that would jeopardize the patient's ability to receive the regimen with reasonable safety. No history of unrelated (non-lymphomatous) neoplasms within past 5 years other than non-melanoma skin cancer or in-situ cancer. Ability to give informed consent.